This document discusses the classification, properties, and design considerations for timber used in construction. It addresses:
- Classification of timber based on strength properties and durability. The strongest timbers are classified as Group A.
- Key properties of timber including its anisotropic nature, moisture sensitivity, and variability between species. Seasoning and preservative treatment are important.
- Design considerations for flexural members including permissible stresses, shear design, bearing length factors, and deflection limits. Form factors must be applied based on member shape.
- Additional engineered wood products used in construction including glued laminated timber, cross-laminated timber, and plywood.
This document summarizes a lecture on flat slab design and analysis. It discusses key topics such as:
1. Definitions of flat slabs and their components like column strips and middle strips.
2. Methods of analyzing flat slabs including numerical methods and manual methods like the method of substitutive beams.
3. Design considerations for flat slabs including steel distribution above columns, welded mesh reinforcement, loading schemes, and punching shear design.
4. Different types of shear reinforcement that can be used at column heads like links, cages, and bent-up bars.
This document discusses trusses, which are triangular frameworks used to span long distances efficiently. There are two main types - plane trusses where members lie in one plane, and space trusses where members are oriented in three dimensions. Trusses are used in roofs, floors, walls, and bridges to efficiently resist loads through axial member forces. They consist of various configurations like pitched roof, parallel chord, and trapezoidal trusses. Truss members can be rolled steel sections or built-up sections. Loads include dead, live, wind, and earthquake loads. Joints connect members and transfer axial forces, with gusset plates used when direct connection is not possible.
This document discusses reinforced concrete columns. Columns act as vertical supports that transmit loads to foundations. Columns may fail due to compression failure, buckling, or a combination. Short columns are more prone to compression failure, while slender columns are more likely to buckle. Column sections can be square, circular, or rectangular. The dimensions and bracing affect whether a column is classified as short or slender. Longitudinal reinforcement and links are designed to resist axial loads and moments based on the column's effective height and end conditions. Design charts are used to determine reinforcement for columns with axial and uniaxial bending loads. Examples show how to design column reinforcement.
The document discusses structural steel, including its composition, properties, types, and applications in construction. It describes how steel is made from iron with added elements, and its varying properties based on carbon content. The types discussed are mild steel, medium carbon steel, and high carbon steel. Common structural steel applications mentioned include beams, columns, trusses, and framing for buildings like airports and stadiums.
1. Structural systems include architectural structures like buildings that are assemblages of components designed to support loads through interconnected members.
2. Loads on structures can be static like dead loads or dynamic like wind loads, and forces like tension, compression, bending, and shear act on structural members.
3. Common structural forms include trusses, arches, shells, frames, and cable nets which use specific geometries and materials like steel and concrete to transfer loads.
This document discusses reinforcement detailing of common reinforced concrete structural members. It provides guidelines on proper detailing practices and common mistakes to avoid. Key points covered include reinforcement requirements for slabs, beams, columns, and foundations. Specific details are given for elements like continuous beams, cantilever beams, beam-column joints, and seismic detailing. The document emphasizes the importance of reinforcement detailing for structural safety and highlights detailing aspects that are essential for execution and safety of reinforced concrete structures.
This document summarizes different structural design concepts and elements. It discusses the forces that act on structures like gravity, wind, and earthquakes. It also describes different structural systems like trusses, frames, shells and their basic elements like beams, columns, slabs. Additionally, it covers structural requirements, types of structures, materials used and provides examples of typical structures.
This publication provides guidance on detailed design of single span steel portal frames according to Eurocode standards. It discusses the importance of considering second order effects in portal frame analysis and design. These effects can reduce the frame's stiffness below that calculated from first order analysis. The publication covers analysis and design approaches at the ultimate limit state and serviceability limit state, including imperfections, base stiffness, deflections, cross section resistance, member stability, bracing, connections, and worked examples. Emphasis is placed on using computer software for analysis and design to achieve the most efficient structural solutions.
This document summarizes a lecture on flat slab design and analysis. It discusses key topics such as:
1. Definitions of flat slabs and their components like column strips and middle strips.
2. Methods of analyzing flat slabs including numerical methods and manual methods like the method of substitutive beams.
3. Design considerations for flat slabs including steel distribution above columns, welded mesh reinforcement, loading schemes, and punching shear design.
4. Different types of shear reinforcement that can be used at column heads like links, cages, and bent-up bars.
This document discusses trusses, which are triangular frameworks used to span long distances efficiently. There are two main types - plane trusses where members lie in one plane, and space trusses where members are oriented in three dimensions. Trusses are used in roofs, floors, walls, and bridges to efficiently resist loads through axial member forces. They consist of various configurations like pitched roof, parallel chord, and trapezoidal trusses. Truss members can be rolled steel sections or built-up sections. Loads include dead, live, wind, and earthquake loads. Joints connect members and transfer axial forces, with gusset plates used when direct connection is not possible.
This document discusses reinforced concrete columns. Columns act as vertical supports that transmit loads to foundations. Columns may fail due to compression failure, buckling, or a combination. Short columns are more prone to compression failure, while slender columns are more likely to buckle. Column sections can be square, circular, or rectangular. The dimensions and bracing affect whether a column is classified as short or slender. Longitudinal reinforcement and links are designed to resist axial loads and moments based on the column's effective height and end conditions. Design charts are used to determine reinforcement for columns with axial and uniaxial bending loads. Examples show how to design column reinforcement.
The document discusses structural steel, including its composition, properties, types, and applications in construction. It describes how steel is made from iron with added elements, and its varying properties based on carbon content. The types discussed are mild steel, medium carbon steel, and high carbon steel. Common structural steel applications mentioned include beams, columns, trusses, and framing for buildings like airports and stadiums.
1. Structural systems include architectural structures like buildings that are assemblages of components designed to support loads through interconnected members.
2. Loads on structures can be static like dead loads or dynamic like wind loads, and forces like tension, compression, bending, and shear act on structural members.
3. Common structural forms include trusses, arches, shells, frames, and cable nets which use specific geometries and materials like steel and concrete to transfer loads.
This document discusses reinforcement detailing of common reinforced concrete structural members. It provides guidelines on proper detailing practices and common mistakes to avoid. Key points covered include reinforcement requirements for slabs, beams, columns, and foundations. Specific details are given for elements like continuous beams, cantilever beams, beam-column joints, and seismic detailing. The document emphasizes the importance of reinforcement detailing for structural safety and highlights detailing aspects that are essential for execution and safety of reinforced concrete structures.
This document summarizes different structural design concepts and elements. It discusses the forces that act on structures like gravity, wind, and earthquakes. It also describes different structural systems like trusses, frames, shells and their basic elements like beams, columns, slabs. Additionally, it covers structural requirements, types of structures, materials used and provides examples of typical structures.
This publication provides guidance on detailed design of single span steel portal frames according to Eurocode standards. It discusses the importance of considering second order effects in portal frame analysis and design. These effects can reduce the frame's stiffness below that calculated from first order analysis. The publication covers analysis and design approaches at the ultimate limit state and serviceability limit state, including imperfections, base stiffness, deflections, cross section resistance, member stability, bracing, connections, and worked examples. Emphasis is placed on using computer software for analysis and design to achieve the most efficient structural solutions.
This document discusses design modifications made to a Nature Appreciation Centre building. The original design utilized a timber floor system, timber facade wall system, and other construction materials. The proposed design modifies the floor system to a hollow core concrete slab and the wall system to a glass curtain wall. Precedent studies of similar structures using these systems are provided, along with descriptions of the materials and advantages and disadvantages of both the original and proposed systems.
This document discusses timber as a structural building material. It notes that timber is a renewable resource with low environmental impact compared to other materials. Timber structures use vertical posts and horizontal beams. As a structure, timber can transmit and resist loads through axial compression and bending. Properties like stress, deflection and strength depend on factors like grain direction, load type and material properties. Timber combines well with other materials like steel and concrete in composite structures.
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help boost feelings of calmness, happiness and focus.
This document discusses different types of roof trusses used in construction. It describes common trusses, which are used to build sloped roofs with a bottom chord and two top chords meeting at the peak. Other types discussed include scissor trusses, raised heel trusses, dropped chord trusses, parallel chord trusses, attic trusses, bowstring trusses, gambrel trusses, and steel trusses. The document provides details on the design and purpose of each type of truss.
The document discusses L-beams, which are floor beams that have slabs on only one side. L-beams are common in reinforced concrete structures and experience bending moment, shear force, and torsional moment from one-sided loading. The effective width of an L-beam flange is calculated according to code recommendations based on factors like beam spacing and length. Design of L-beams involves determining the flange width, selecting a beam depth, checking moment of resistance, and adding reinforcement as needed to resist bending and shear loads.
Framed structures are building skeleton frameworks formed by columns and beams. There are two main types: in-situ reinforced concrete frames and prefabricated frames. Rectangular framed structures use columns and beams arranged at right angles to support floors, walls, and roofs. They are commonly used for multi-story buildings like offices, schools, and hospitals. Framed structures provide large open floor plans and are adaptable to different shapes. Earthquake-resistant features in framed structures include shear walls, moment-resisting frames, and braced structures which resist lateral forces during seismic activity.
This document discusses shear wall analysis and design. It defines shear walls as structural elements used in buildings to resist lateral forces through cantilever action. The document classifies different types of shear walls and discusses their behavior under seismic loading. It outlines the steps for designing shear walls, including reviewing layout, analyzing structural systems, determining design forces, and detailing reinforcement. The document emphasizes the importance of properly locating shear walls in a building to resist seismic loads and minimize torsional effects.
Lec06 Analysis and Design of T Beams (Reinforced Concrete Design I & Prof. Ab...Hossam Shafiq II
1) T-beams are commonly used structural elements that can take two forms: isolated precast T-beams or T-beams formed by the interaction of slabs and beams in buildings.
2) The analysis and design of T-beams considers the effective flange width provided by slab interaction or the dimensions of an isolated precast flange.
3) Two methods are used to analyze T-beams: assuming the stress block is in the flange and using rectangular beam theory, or using a decomposition method if the stress block extends into the web.
This document discusses the design of reinforced concrete deep beams. It defines deep beams as having a span/depth ratio less than 2 or a continuous beam ratio less than 2.5. Deep beams behave differently than elementary beam theory due to non-linear stress distributions. Their behavior depends on loading type and cracking typically occurs between one-third to one-half of the ultimate load. Design considerations include checking for minimum thickness, flexural design, shear design, and anchorage of tension reinforcement.
Footings are structural members that support columns and walls and transmit their loads to the soil. Different types of footings include wall footings, isolated/single footings, combined footings, cantilever/strap footings, continuous footings, rafted/mat foundations, and pile caps. Footings must be designed to safely carry and transmit loads to the soil while meeting code requirements regarding bearing capacity, settlement, reinforcement, and shear strength. A proper footing design involves determining loads, allowable soil pressure, reinforcement requirements, and assessing settlement.
The document discusses reinforced concrete columns, including their functions, failure modes, classifications, and design considerations. Columns primarily resist axial compression but may also experience bending moments. They can fail due to compression, buckling, or a combination. Design depends on whether the column is short or slender, braced or unbraced. Reinforcement is designed based on the column's expected loads and dimensions using methods specified in design codes like BS 8110.
The document discusses various types of floor finishes that can be used for commercial, residential and industrial settings. It describes different flooring materials like tiles, wood, PVC, marble, granite, glass and natural stones. For each material, it provides details on types, finish, durability, usage, installation process, costs and maintenance requirements. The document also provides specifications and laying procedures for ceramic tiles and stone flooring.
This document provides an overview of the design of steel beams. It discusses various beam types and sections, loads on beams, design considerations for restrained and unrestrained beams. For restrained beams, it covers lateral restraint requirements, section classification, shear capacity, moment capacity under low and high shear, web bearing, buckling, and deflection checks. For unrestrained beams, it discusses lateral torsional buckling, moment and buckling resistance checks. Design procedures and equations for determining effective properties and capacities are also presented.
This document provides a summary of reinforced concrete columns (RCC columns). It defines a column and describes different types of columns based on reinforcement and length. Short columns are less than 12 times the minimum thickness, while long columns are greater than 12 times the thickness. The document outlines preliminary sizing of columns and the functions of tie/spiral reinforcement. It includes design equations for axially loaded columns in working stress design (WSD) and ultimate stress design (USD). Two sample problems are worked through demonstrating column design using both methods.
Composite structure of concrete and steel.Suhailkhan204
This document discusses composite structures, which combine steel and concrete materials. The key elements of composite structures are composite deck slabs, beams, and columns, along with shear connectors. Composite structures take advantage of concrete's compressive strength and steel's tensile strength. They provide benefits like increased load capacity, stiffness, fire resistance, and cost savings compared to traditional steel or concrete construction alone. An example project, the Millennium Tower in Vienna, is described. The document analyzes costs and concludes that composite structures are best suited for high-rise buildings due to reduced weight, increased ductility, and savings of around 10% compared to reinforced concrete.
information on types of beams, different methods to calculate beam stress, design for shear, analysis for SRB flexure, design for flexure, Design procedure for doubly reinforced beam,
Ch1 Introduction (Steel Bridges تصميم الكباري المعدنية & Prof. Dr. Metwally A...Hossam Shafiq II
This document provides an introduction to steel bridges, including:
1. It discusses the history and evolution of bridge engineering and the key components of bridge structures.
2. It describes different classifications of bridges according to materials, usage, position, and structural forms. The structural forms include beam bridges, frame bridges, arch bridges, cable-stayed bridges, and suspension bridges.
3. It provides examples of different types of bridges and explains the basic structural systems used in bridges, including simply supported, cantilever, and continuous beams as well as rigid frames.
The document discusses various wood substitute materials used in construction, including:
1) Veneer and plywood - Made by gluing thin wood sheets together in alternating directions for strength.
2) Particle board - Made by embedding wood particles in resin under heat and pressure.
3) Fiber board - Similar to particle board but uses wood fibers instead of particles.
It provides details on the manufacturing processes and applications of these common wood substitute building materials.
The document discusses various design considerations for concrete structures, including:
1. It compares the working stress method and limit state method for structural design.
2. It outlines factors that affect the durability of concrete like permeability, environment, cover thickness, and workmanship.
3. It provides requirements for structural design considerations like resisting overturning moments, sliding, lateral sway, and moment connections.
4. It addresses serviceability limits states like crack width, deflection limits, and vibration effects.
This document provides guidelines for detailing of reinforcement in reinforced concrete structures according to Indian codes IS456 and IS13920. Some key points discussed include:
- Minimum cover requirements and spacing of reinforcement bars
- Development lengths and lap splicing of bars
- Detailing requirements for beams, columns, and joints to provide ductility under seismic loads
- Use of confining reinforcement and closed stirrups in potential plastic hinge regions
This document discusses design modifications made to a Nature Appreciation Centre building. The original design utilized a timber floor system, timber facade wall system, and other construction materials. The proposed design modifies the floor system to a hollow core concrete slab and the wall system to a glass curtain wall. Precedent studies of similar structures using these systems are provided, along with descriptions of the materials and advantages and disadvantages of both the original and proposed systems.
This document discusses timber as a structural building material. It notes that timber is a renewable resource with low environmental impact compared to other materials. Timber structures use vertical posts and horizontal beams. As a structure, timber can transmit and resist loads through axial compression and bending. Properties like stress, deflection and strength depend on factors like grain direction, load type and material properties. Timber combines well with other materials like steel and concrete in composite structures.
The document discusses the benefits of exercise for mental health. Regular physical activity can help reduce anxiety and depression and improve mood and cognitive functioning. Exercise causes chemical changes in the brain that may help boost feelings of calmness, happiness and focus.
This document discusses different types of roof trusses used in construction. It describes common trusses, which are used to build sloped roofs with a bottom chord and two top chords meeting at the peak. Other types discussed include scissor trusses, raised heel trusses, dropped chord trusses, parallel chord trusses, attic trusses, bowstring trusses, gambrel trusses, and steel trusses. The document provides details on the design and purpose of each type of truss.
The document discusses L-beams, which are floor beams that have slabs on only one side. L-beams are common in reinforced concrete structures and experience bending moment, shear force, and torsional moment from one-sided loading. The effective width of an L-beam flange is calculated according to code recommendations based on factors like beam spacing and length. Design of L-beams involves determining the flange width, selecting a beam depth, checking moment of resistance, and adding reinforcement as needed to resist bending and shear loads.
Framed structures are building skeleton frameworks formed by columns and beams. There are two main types: in-situ reinforced concrete frames and prefabricated frames. Rectangular framed structures use columns and beams arranged at right angles to support floors, walls, and roofs. They are commonly used for multi-story buildings like offices, schools, and hospitals. Framed structures provide large open floor plans and are adaptable to different shapes. Earthquake-resistant features in framed structures include shear walls, moment-resisting frames, and braced structures which resist lateral forces during seismic activity.
This document discusses shear wall analysis and design. It defines shear walls as structural elements used in buildings to resist lateral forces through cantilever action. The document classifies different types of shear walls and discusses their behavior under seismic loading. It outlines the steps for designing shear walls, including reviewing layout, analyzing structural systems, determining design forces, and detailing reinforcement. The document emphasizes the importance of properly locating shear walls in a building to resist seismic loads and minimize torsional effects.
Lec06 Analysis and Design of T Beams (Reinforced Concrete Design I & Prof. Ab...Hossam Shafiq II
1) T-beams are commonly used structural elements that can take two forms: isolated precast T-beams or T-beams formed by the interaction of slabs and beams in buildings.
2) The analysis and design of T-beams considers the effective flange width provided by slab interaction or the dimensions of an isolated precast flange.
3) Two methods are used to analyze T-beams: assuming the stress block is in the flange and using rectangular beam theory, or using a decomposition method if the stress block extends into the web.
This document discusses the design of reinforced concrete deep beams. It defines deep beams as having a span/depth ratio less than 2 or a continuous beam ratio less than 2.5. Deep beams behave differently than elementary beam theory due to non-linear stress distributions. Their behavior depends on loading type and cracking typically occurs between one-third to one-half of the ultimate load. Design considerations include checking for minimum thickness, flexural design, shear design, and anchorage of tension reinforcement.
Footings are structural members that support columns and walls and transmit their loads to the soil. Different types of footings include wall footings, isolated/single footings, combined footings, cantilever/strap footings, continuous footings, rafted/mat foundations, and pile caps. Footings must be designed to safely carry and transmit loads to the soil while meeting code requirements regarding bearing capacity, settlement, reinforcement, and shear strength. A proper footing design involves determining loads, allowable soil pressure, reinforcement requirements, and assessing settlement.
The document discusses reinforced concrete columns, including their functions, failure modes, classifications, and design considerations. Columns primarily resist axial compression but may also experience bending moments. They can fail due to compression, buckling, or a combination. Design depends on whether the column is short or slender, braced or unbraced. Reinforcement is designed based on the column's expected loads and dimensions using methods specified in design codes like BS 8110.
The document discusses various types of floor finishes that can be used for commercial, residential and industrial settings. It describes different flooring materials like tiles, wood, PVC, marble, granite, glass and natural stones. For each material, it provides details on types, finish, durability, usage, installation process, costs and maintenance requirements. The document also provides specifications and laying procedures for ceramic tiles and stone flooring.
This document provides an overview of the design of steel beams. It discusses various beam types and sections, loads on beams, design considerations for restrained and unrestrained beams. For restrained beams, it covers lateral restraint requirements, section classification, shear capacity, moment capacity under low and high shear, web bearing, buckling, and deflection checks. For unrestrained beams, it discusses lateral torsional buckling, moment and buckling resistance checks. Design procedures and equations for determining effective properties and capacities are also presented.
This document provides a summary of reinforced concrete columns (RCC columns). It defines a column and describes different types of columns based on reinforcement and length. Short columns are less than 12 times the minimum thickness, while long columns are greater than 12 times the thickness. The document outlines preliminary sizing of columns and the functions of tie/spiral reinforcement. It includes design equations for axially loaded columns in working stress design (WSD) and ultimate stress design (USD). Two sample problems are worked through demonstrating column design using both methods.
Composite structure of concrete and steel.Suhailkhan204
This document discusses composite structures, which combine steel and concrete materials. The key elements of composite structures are composite deck slabs, beams, and columns, along with shear connectors. Composite structures take advantage of concrete's compressive strength and steel's tensile strength. They provide benefits like increased load capacity, stiffness, fire resistance, and cost savings compared to traditional steel or concrete construction alone. An example project, the Millennium Tower in Vienna, is described. The document analyzes costs and concludes that composite structures are best suited for high-rise buildings due to reduced weight, increased ductility, and savings of around 10% compared to reinforced concrete.
information on types of beams, different methods to calculate beam stress, design for shear, analysis for SRB flexure, design for flexure, Design procedure for doubly reinforced beam,
Ch1 Introduction (Steel Bridges تصميم الكباري المعدنية & Prof. Dr. Metwally A...Hossam Shafiq II
This document provides an introduction to steel bridges, including:
1. It discusses the history and evolution of bridge engineering and the key components of bridge structures.
2. It describes different classifications of bridges according to materials, usage, position, and structural forms. The structural forms include beam bridges, frame bridges, arch bridges, cable-stayed bridges, and suspension bridges.
3. It provides examples of different types of bridges and explains the basic structural systems used in bridges, including simply supported, cantilever, and continuous beams as well as rigid frames.
The document discusses various wood substitute materials used in construction, including:
1) Veneer and plywood - Made by gluing thin wood sheets together in alternating directions for strength.
2) Particle board - Made by embedding wood particles in resin under heat and pressure.
3) Fiber board - Similar to particle board but uses wood fibers instead of particles.
It provides details on the manufacturing processes and applications of these common wood substitute building materials.
The document discusses various design considerations for concrete structures, including:
1. It compares the working stress method and limit state method for structural design.
2. It outlines factors that affect the durability of concrete like permeability, environment, cover thickness, and workmanship.
3. It provides requirements for structural design considerations like resisting overturning moments, sliding, lateral sway, and moment connections.
4. It addresses serviceability limits states like crack width, deflection limits, and vibration effects.
This document provides guidelines for detailing of reinforcement in reinforced concrete structures according to Indian codes IS456 and IS13920. Some key points discussed include:
- Minimum cover requirements and spacing of reinforcement bars
- Development lengths and lap splicing of bars
- Detailing requirements for beams, columns, and joints to provide ductility under seismic loads
- Use of confining reinforcement and closed stirrups in potential plastic hinge regions
Calulation of deflection and crack width according to is 456 2000Vikas Mehta
This document discusses the calculation of crack width in reinforced concrete flexural members. It provides information on:
1) Crack width is calculated to satisfy serviceability limits and is only relevant for Type 3 pre-stressed concrete members that crack under service loads.
2) Crack width depends on factors like amount of pre-stress, tensile stress in bars, concrete cover thickness, bar diameter and spacing, member depth and location of neutral axis, bond strength, and concrete tensile strength.
3) The method of calculation involves determining the shortest distance from the surface to a bar and using equations involving member depth, neutral axis depth, average strain at the surface level. Permissible crack widths are specified depending on exposure
Cement Bonded Particle Board Manufacturer in India -Bison Panel Product Guide...BisonPanel1
Bison Panel or also known as Bison Board is a Cement Bonded Particle Board made out of Cement and Mineralised wood particles.
As Bison Panels are extremely Durable, Flexible, Fire and Water resistant in nature, these multi – purpose boards can be used for both Interior and Exterior applications ranging from False Ceiling, Partitions, Internal and External Wall Cladding, Furniture, Wardrobes etc.
Bison Panels / Bison boards are Eco – friendly and Non – Toxic in Nature. It is a Non-carcinogenic material and 100% asbestos free.
https://bisonpanel.com
This document provides a table listing standard sizes for framing lumber. It shows the nominal and dressed dimensions for various thicknesses and widths of lumber. It also notes that thicknesses may be up to 1/2 inch smaller when rough or surfaced on four sides. Additional sections describe decking dimensions and explain terms like tongue and grooved. Diagrams are included to illustrate different types of wood stresses like horizontal shear, compression perpendicular to grain, and modulus of elasticity. Lumber is typically shipped in multiples of 2 feet lengths for pieces 6 feet and longer.
This document provides information about timber, including its definition, structure, classifications, properties, defects, seasoning, preservation, fireproofing, and common types. Timber is defined as wood that retains its natural structure and composition and is suitable for engineering works. It discusses the structures of softwoods and hardwoods. Classifications include based on growth, durability, seasoning characteristics, and grading. General properties, mechanical properties, and qualities of good timber are outlined. Various natural and manufactured defects that can occur in timber are described. The methods and advantages of seasoning timber are explained. The document also covers the types of preservatives used to treat timber, the preparation and methods of treatment, and characteristics of good preservatives
This document discusses modal analysis of composite sandwich panels through finite element modeling. A CAD model of a composite sandwich panel with an aluminum honeycomb core and composite face sheets is created and meshed. Material properties are applied to the different components. Free vibration analysis is conducted and the first three natural frequencies and mode shapes are obtained for simply supported and cantilever boundary conditions. The finite element results are compared to analytical calculations for the cantilever case, showing good agreement with errors under 9% for the first two modes. In conclusion, the natural frequencies of the composite sandwich panel are calculated for different boundary conditions through finite element analysis.
Optimization of percentages of steel and glass fiber reinforced concreteeSAT Journals
Abstract Cementitious matrices are the fragile materials that possess a low tensile strength. The addition of fibers randomly distributed in these matrices improves their resistance to cracking, substantially. However, the incorporation of fibers into a plain concrete disrupts the granular skeleton and quickly causes problems of mixing as a result of the loss of mixture workability that will be translated into a difficult concrete casting in site. This study was concerned on the one hand with optimizing the fibers reinforced concrete mixes in the fresh state, and on the other hand with assessing the mechanical behaviour of this mixture in the hardened state, in order to establish a compromise between the two states . In this paper optimization of fibers by using different percentages in steel and glass fiber reinforced concrete of grade M 70 have been studied. It optimizes 1.5% for steel Fiber content and 1% for glass fiber content by the volume of cement is used in concrete. Keywords: fibers, fragile materials, cracking, substantially
This is a Power Point Presentation discussing briefly about the Slab, Beam & Column of a building construction. It was presented on 6th March, 2014 as part of the Presentations of the subject: DETAILS OF CONSTRUCTION, at Ahsanullah University of Science & Technology (AUST)
Timber is one of the oldest building materials and remains a versatile material for indoor comfort. It exists in many species and forms. There are two main types of timber-producing trees: softwoods and hardwoods. Softwoods are coniferous and evergreen, while hardwoods are broadleaf and deciduous. Timber must be properly seasoned and treated to improve its durability and resistance to fungi and insects. Its properties, such as strength and durability, can vary depending on factors like density, grain direction, and defects. Proper conversion and use of timber helps minimize defects and maximize its strengths for construction.
This document provides an introduction to steel and timber structures. It discusses the objectives of the chapter, which are to introduce structural steel, describe common structural members and shapes, explain structural design concepts and material properties of steel. It outlines different types of steel structures, why steel is used, various structural members, and design methods like allowable stress design, plastic design and limit state design. Key material properties of structural steel like its stress-strain behavior and grades are also summarized.
This document discusses the potential for bamboo as a replacement for steel in construction. It begins by outlining the high costs and environmental impacts of steel production. Bamboo is presented as a sustainable alternative that is inexpensive, widely available, and has properties comparable to steel. The document then provides details on the types and distribution of bamboo species globally. It compares the mechanical properties of bamboo to steel and other materials. The final sections cover techniques for selecting, preparing, and using bamboo for reinforcement in concrete, as well as advantages like lower carbon emissions and disadvantages like brittleness.
1. The document provides notes on structural engineering topics like slabs, waffle slabs, hidden beams, one-way slabs, and columns.
2. It explains the different types of bars in slabs, the spacing requirements, and how to calculate effective depth. Waffle slabs and hidden beams are described along with their purposes and advantages.
3. The document provides the code specifications for designing a one-way slab and works through an example problem. It also discusses the differences between plinth beams and tie beams.
The document discusses composite materials and fibers, including how to calculate strength and modulus for different fiber lengths and orientations. It covers long, short, and very short fibers. It also discusses various polymer matrix composites (PMCs) like glass fiber reinforced polymer (GFRP), carbon fiber reinforced polymer (CFRP), and aramid fiber reinforced polymer (AFRP), as well as fabrication methods like prepreg, pultrusion, and filament winding. Other topics include strengthening mechanisms, ceramic matrix composites, transformation toughening, and structural composites.
A Comparative Study on Enhancing the Factor of Safety for Retaining Walls Aga...IRJET Journal
This document presents a comparative study on enhancing the factor of safety for retaining walls against failure through the use of reinforcement strips in soil. It analyzes retaining wall models of varying heights using numerical calculations to compare the factor of safety against pulling out, breaking of strips, bearing capacity failure, overturning and sliding in reinforced versus unreinforced walls. The results provide knowledge on the internal and external stability of reinforced earth retaining walls. Galvanized steel strips are used as reinforcements and their inclusion is found to boost the wall's service life and safety against various failure modes through increased soil confinement.
This document discusses timber, including its classification, properties, and uses. It begins by defining timber as wood used for construction works. It then discusses how timber is classified based on mode of growth (exogenous vs endogenous), modulus of elasticity, durability, grading, and availability. Key properties of good timber are also outlined, such as color, odor, strength, and durability. Finally, common uses of timber in construction, transportation, industrial applications, and more are listed.
This document discusses timber, including its classification and properties. It begins by defining timber as wood used for construction works. It then discusses how timber is classified based on its mode of growth (exogenous vs endogenous), modulus of elasticity, durability, grading, and availability. Key properties of good timber are also outlined, such as color, odor, strength, and durability. The document concludes by listing several common uses of timber in construction and other applications.
The document discusses limit state design of reinforced concrete structures. It defines two main limit states - limit state of collapse and limit state of serviceability. Limit state of collapse deals with strength and stability under maximum loads, while serviceability deals with deflection, cracking and durability under service loads. Characteristic loads have a 95% probability of not being exceeded and are factored up using partial safety factors for design loads. Material strengths are reduced using partial safety factors to calculate design strengths. The document also derives design coefficients for moment of resistance, depth of neutral axis and percentage steel reinforcement for rectangular sections under flexure.
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Strategies for Effective Upskilling is a presentation by Chinwendu Peace in a Your Skill Boost Masterclass organisation by the Excellence Foundation for South Sudan on 08th and 09th June 2024 from 1 PM to 3 PM on each day.
The simplified electron and muon model, Oscillating Spacetime: The Foundation...RitikBhardwaj56
Discover the Simplified Electron and Muon Model: A New Wave-Based Approach to Understanding Particles delves into a groundbreaking theory that presents electrons and muons as rotating soliton waves within oscillating spacetime. Geared towards students, researchers, and science buffs, this book breaks down complex ideas into simple explanations. It covers topics such as electron waves, temporal dynamics, and the implications of this model on particle physics. With clear illustrations and easy-to-follow explanations, readers will gain a new outlook on the universe's fundamental nature.
বাংলাদেশের অর্থনৈতিক সমীক্ষা ২০২৪ [Bangladesh Economic Review 2024 Bangla.pdf] কম্পিউটার , ট্যাব ও স্মার্ট ফোন ভার্সন সহ সম্পূর্ণ বাংলা ই-বুক বা pdf বই " সুচিপত্র ...বুকমার্ক মেনু 🔖 ও হাইপার লিংক মেনু 📝👆 যুক্ত ..
আমাদের সবার জন্য খুব খুব গুরুত্বপূর্ণ একটি বই ..বিসিএস, ব্যাংক, ইউনিভার্সিটি ভর্তি ও যে কোন প্রতিযোগিতা মূলক পরীক্ষার জন্য এর খুব ইম্পরট্যান্ট একটি বিষয় ...তাছাড়া বাংলাদেশের সাম্প্রতিক যে কোন ডাটা বা তথ্য এই বইতে পাবেন ...
তাই একজন নাগরিক হিসাবে এই তথ্য গুলো আপনার জানা প্রয়োজন ...।
বিসিএস ও ব্যাংক এর লিখিত পরীক্ষা ...+এছাড়া মাধ্যমিক ও উচ্চমাধ্যমিকের স্টুডেন্টদের জন্য অনেক কাজে আসবে ...
How to Build a Module in Odoo 17 Using the Scaffold MethodCeline George
Odoo provides an option for creating a module by using a single line command. By using this command the user can make a whole structure of a module. It is very easy for a beginner to make a module. There is no need to make each file manually. This slide will show how to create a module using the scaffold method.
This slide is special for master students (MIBS & MIFB) in UUM. Also useful for readers who are interested in the topic of contemporary Islamic banking.
Exploiting Artificial Intelligence for Empowering Researchers and Faculty, In...Dr. Vinod Kumar Kanvaria
Exploiting Artificial Intelligence for Empowering Researchers and Faculty,
International FDP on Fundamentals of Research in Social Sciences
at Integral University, Lucknow, 06.06.2024
By Dr. Vinod Kumar Kanvaria
How to Manage Your Lost Opportunities in Odoo 17 CRMCeline George
Odoo 17 CRM allows us to track why we lose sales opportunities with "Lost Reasons." This helps analyze our sales process and identify areas for improvement. Here's how to configure lost reasons in Odoo 17 CRM
it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
Physiology and chemistry of skin and pigmentation, hairs, scalp, lips and nail, Cleansing cream, Lotions, Face powders, Face packs, Lipsticks, Bath products, soaps and baby product,
Preparation and standardization of the following : Tonic, Bleaches, Dentifrices and Mouth washes & Tooth Pastes, Cosmetics for Nails.
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
2. Types of timber – Classification –
Allowable stresses – Design of beams
Flexure, Shear, Bending and Deflection
considerations – Design of columns –
Design of composite beam sections with
timber and steel .
2
3. Earliest building material used
From Engineering point of view, Timber is
different from Wood
Timber is wood for building - the wood at
any stage after the tree has been felled
Used for both temporary and permanent
structures
Scaffolding Formwork
Shuttering Purlin
Door Beam
There are 100-200 types of timber
3
SAPWOOD HEARTWOOD
PITH
BARK
CAMBIUM
4. Biological and natural material with
highly variable properties
Hygroscopic – moisture content varies
with relative humidity of surroundings
Timber is capable of transferring both
tensile and compressive forces
Non corrosive and highly durable if
detailed properly
Very high strength to weight ratio
Physical & mechanical properties varies in
different directions with respect to fibre
orientation
4
Strength when loaded parallel to grain > when loaded perpendicular to grain
5. Timber is viable to seasonal cracks and
warping
Factor of safety depends on the exposure
conditions (inside, outside & wet) [Table 1]
Well seasoned timber are less liable to
volume changes
Green timber is weak
There is a risk of biological degradation,
when exposed to high moisture
conditions. [Table 2]
Defects in wood include knots, cracks,
wane, shake, dry rot, attack from termites,
white ants, wood borers etc.
5
6. Typical Characteristics of Wood
wood has higher strength per unit weight than most
other construction materials
A non-homogeneous and anisotropic material
showing different characteristics not only in different
directions but also in tension and compression.
Shrinkage of wood on drying is relatively large.
Joints loosen easily due to contraction in the
direction perpendicular to fibres. Therefore dry
wood shall be used with the moisture content less
than 20 %.
The elastic modulus is small. Consequently, members
are apt to show large deformations
6
7. Typical Characteristics of Wood…
A notable creep phenomenon occurs under
permanent vertical loads. This is important
especially in snowy areas.
Large deformation occurs due to compressive
force perpendicular to fibers. This influences the
amount of deformation of horizontal members
and chord members of built-up members.
The defects and notches of wood influence
greatly its strength and stiffness. Consequently
it is necessary to select and to arrange
structural members considering their structural
properties.
7
8. Typical Characteristics of Wood…
Wood can decay from repeated changes of
moisture. Therefore seasoned wood should be
used in construction.
Preservative treatment is necessary to avoid
premature rotting and insect attack.
Wood is a combustible material. Precautions must
be taken to minimize the danger of fire.
Lengths more than 3.5 m long and large size
timbers are difficult to obtain. This leads to splicing
through connectors or gluing.
In view of its lightness, very easy workability like
cutting and nailing and safe transportability, timber
makes an excellent material for post-earthquake
relief and rehabilitation construction.
8
10. Species of timber recommended for constructional
purposes are classified into 3 groups based on
their strength properties, Modulus of Elasticity (E)
& Extreme fiber stress in bending and tension (𝒇𝒃)
Group A- E > 12.6 x 103
N/𝑚𝑚2
𝒇𝒃> 18 N/𝑚𝑚2
Group B – 9.8 x 103
<E < 12.6x103
N/𝑚𝑚2
12>𝒇𝒃> 18 N/𝑚𝑚2
Group C - 5.6 x 103
<E < 9.8 x 103
N/𝑚𝑚2
8.5 >𝒇𝒃>12 N/𝑚𝑚2
10
IS 883-1994
11. Group A- Mangrove, Dhaman, Bullet wood
Group B – Babul, Ebony, Oak, Teak,
Eucalyptus
Group C - Jack, Maple, Neem, Deodar,
Coconut, Rosewood, Walnut
Table 1
IS 883:1994
11
12. Classification for preservation based on durability
tests
1 – Average life > 120 months
2 – 60 months < Average life < 120 months
3 – Average life < 60 months
12
13. Classification based on treatability grades
a - heartwood easily treatable
b – heartwood treatable, but complete penetration
not always obtained; least dimension > 60mm
c – heartwood only partially treatable
d – heartwood refractory to treatment
e - heartwood very refractory to treatment,
penetration of preservative being practically nil
even from the ends
13
14. Classification based on seasoning behavior of
timber and refractoriness with respect to cracking,
splitting and drying rate
A – Highly refractory (slow and difficulty to season
free from surface and end cracking)
B – Moderately refractory (may be seasoned free from
surface and end cracking within reasonably short
periods, given a little protection against rapid drying
conditions)
C – Non refractory (may be rapidly seasoned free from
surface and end cracking even in open air & sun)
14
15. strength properties depend on:
1) Wood species
2) Direction of loading relative to the grain of wood
3) Defects like knots, checks, cracks, splits, shakes
and wanes
4) Moisture content or seasoning
5) Type of wood, such as sapwood, pith and wood
from dead trees
6) Location of use, viz. inside protected, outside,
alternate wetting and drying.
15
16. The permissible stresses must be determined
taking all these factors into account.
Table 6.1 gives typical basic stresses for
timbers placed in three groups A, B and C
classified on the basis of their stiffness.
It is reasonable to increase the normal
permissible stress by a factor of 1.33 to 1.5
when earthquake stresses are superimposed.
16
17. 17
The permissible bearing stress depends on the
inclination of the direction of stress to that of the
grain, the length of the bearing area and its
distance from the free end of the member.
Larger the slope of grain more is the strength
reduction
Select Grade 1 in 20
Grade 1 1 in 15
Grade 2 1 in 12
The strength transverse to grain is minimum
18. 18
Cl:6.2 The permissible stresses of Groups A, B
and C (Grade 1) of different locations of use are
given in Table 1
Minimum permissible stress limits are given in
Table 3. The following conditions should be met.
a. Timber should be of high or moderate
durability, suitable treatment should be given
if necessary
b. Timber of low durability shall be used after
giving proper preservative treatment (IS 401-1982)
c. Loads should be continuous and permanent
IS 883-2016
19. Cl:6.3 Permissible stresses of other grades
of timber (Table 1&3) should be
multiplied by the following factors
a. For Select Grade Timber 1.16
b. For Grade 2 Timber 0.84
When low durability timbers are to be
used on outside location, the permissible
stresses for all grades of timber, arrived
by Cl 6.2 & 6.3 shall be multiplied by 0.80
19
20. Modification Factors for Permissible
Stresses
a. Due to change in slope of grain
Timber with major defects, Permissible
stresses in Table 1 shall be multiplied by a
Modification factor 𝐾1(Table 4)
b. Due to duration of load
For different durations of design load, the
permissible stresses in Table 1 shall be multiplied
by a modification factor 𝐾2(Table 5)
20
21. 21
Cl:7 All structural members, assemblies or
framework in a building, in combination with the
floors, walls and other structural parts of the
building shall be capable of sustaining, with due
stability and stiffness the whole dead and imposed
loads (as specified) without exceeding the limits of
relevant stresses specified.
Cl:7.2 Worst combination and location of loads
shall be considered for design
Cl:7.4.1 The net section shall be obtained by
deducting the gross sectional area of timber the
projected area of all material removed by boring,
grooving or other means of critical plane
IS 883-
23. 23
Cl:7.5 Flexural Members
7.5.2 Effective span = distance from supports
+ 2(half the bearing width)
For continuous beams, distance between center of bearings
7.5.3 Bending Stress
fab =
𝑀
𝑍
fb
fab – Calculated bending stress in extreme fiber
fb– Permissible bending stress on extreme fiber
7.5.4 Form factors shall be applied to bending stress
K3 Rectangular section
K4 Box & I beams
K5 Solid circular
K6 Square cross section
IS 883
24. 24
Cl 7.5.5 Minimum Width > 50mm OR
1/50 of span
Cl 7.5.6 Depth < 3 times width
If Cl 7.5.5 & 7.5.6 cannot be satisfied, lateral stiffening should
be provided to resist bending or buckling
Cl 7.5.7 Shear
Cl 7.5.7.1 Maximum horizontal shear H
When load moves from support towards center &
load is at a distance of 3 to 4 times depth of beam
from support
Cl 7.5.7.2 Vertical end reaction or Shear at a section V
For concentrated & uniformly distributed loads
Cl 7.5.7.3 Deductions in load & Table 6 [Reduction
factors for concentrated loads]
IS 883
Greater
25. 25
Cl 7.5.8 Bearing
Cl 7.5.8.1 Ends of flexural member shall be supported in
recesses which provide adequate ventilation to
prevent dry rot & shall not be enclosed
Cl7.5.8.3 Bearing Stress
V
𝐛𝐝
It is the vertical stress on the bearing area, should be less
than the permissible stress in compression perpendicular to
the grain fcn(Table 1) for a bearing length ≥ 150mm
Cl7.5.8.3.1 (c) For bearing length < 150mm & located
75mm or more from the end of the member, the
permissible stress shall be multiplied by
Modification factor K7(Table 13)
IS 883-1994
26. 26
Cl 7.5.9.6 Deflection
Cl 7.5.9.6.1 Deflection of flexural members supporting brittle
materials < 1/360 of span
Other Flexural members < 1/240 of span
Cantilever 1/150 of freely hanging length
Cl7.5.9.6.2 Deflection δ
δ =
𝑲𝑾𝑳𝟑
𝑬𝑰
K values are given for different loading conditions
IS 883-1994
27. 27
Solid beams
Built up beam
Composed of vertical sections that are bolted together
firmly. Used for large spans and higher loads
Flitched beam
It consist of 2 or more timber pieces
which is reinforced with steel plates
Notched beam
Grooves are cut in the soffit of beams at supports or at
mid span
Notch
Notch
29. Timber compression members may have solid rectangular or
circular cross section which may be uniform throughout the
length or tapering.
Cl 7.6.1 Solid Columns
Short S/d 11
Intermediate 11 < S/d < K8
Long S/d > K8
The permissible compressive stress values for Solid
columns are given in Cl 7.6.1.1, 7.6.1.2 & 7.6.1.3
Cl 7.6.1.4 For solid timber columns, S/d shall not
exceed 50
The permissible compressive stress values for circular columns
andtaperedcross sectional columnsaregivenin Cl 7.6.1.6 & 7.6.1.7
29
IS 883
S –overall unsupported
length of the column
30. 30
Cl7.6.2 Box & Built up Columns
Built-up columns are formed by spiking, nailing or
bolting together planks or square sections. Planks must be
fastened together at regular intervals (<6 times thickness)
Box columns are made by connecting planks together so
as to have a hollow core inside. The core is blocked by solid
pieces of timber at the ends and intermediate points. The pieces
are joined by screws, nails, bolts, glue or other connectors.
Slenderness ratio (Sr) is given by
𝑆
𝑑1
2 +𝑑2
2
d1 and d2 are least dimension of overall width and core width
respectively
IS 883
31. 31
Short columns Sr< 8
Intermediate Columns 8 > Sr > K9
Long Columns Sr > K9
The permissible compressive stress values for box columns
are given in Cl 7.6.2.2, 7.6.2.3 & 7.6.2.4
Cl 7.6.3 Spaced Columns
The formulae for calculating permissible compressive stress of
short solid columns are applicable to spaced columns with a
restraint factor of 2.5 to 3
The permissible compressive stress values for intermediate and
long spaced columns are given in Cl 7.6.3.1 & 7.6.3.2
32. 32
Usually employed in trusses with nailed, bolted or disc
dowelled connections
Spaced column consist of 2 or more wooden members
with their longitudinal axis parallel and joined at their
end and intermediate points by block pieces
These members are separated from each other by means
of spacer blocks
Thickness of spacer block ≥ thickness of individual
components
Safe load carrying capacity
of spaced column is the
sum of safe load carrying
capacities of individual
members
33. Wooden beam reinforced with steel strips form
composite beams.
Flitched section are stronger than pure wooden
beams of same dimensions and are also
economical.
reinforcing material should have a modulus of
elasticity greater than that of the reinforced
material.
The steel plates are bolted or screwed to the
timber beams. The connection is made
perfectly such that there is no slipping between
them.
The composite beam behaves like a single
33
35. The bending theory is valid when a constant
value of Young's modulus applies across a
section
it cannot be used directly to solve the
composite-beam problems where two
different materials, and therefore different
values of E, exists.
The method of solution in such a case is to
replace one of the materials by an
equivalent section of the other.
35
36. Assumption
In order to analyze the behavior of composite
beams, make the assumption that the materials
are bonded rigidly together so that there can be no
relative axial movement between them.
This means that all the assumptions, which were
valid for homogenous beams are valid except the
one assumption that is no longer valid is that the
Young's Modulus is the same throughout the
beam.
36
38. Beam have stiffening plates
The equivalent beam of the main beam
material can be formed by scaling the breadth
of the plate material in proportion to modular
ratio.
the strain at any level is same in both
materials, the bending stresses in them are in
proportion to the Young's modulus.
38
39. Strain Compatibility
With two materials bonded together, both will
act as one, and the deformation in each is the
same.
Therefore, the strains will be the same in each
material under axial load.
In flexure the strains are the same as in a
homogeneous section, i.e. linear.
In flexure, if the two materials are at the same
distance from the N.A., they will have the same
strain at that point because both materials
share the same strain diagram.
39
41. Strain Compatibility
The stress in each material is determined by
using Young’s Modulus
Care must be taken that the elastic limit of
each material is not exceeded. The elastic
limit can be expressed in either stress or
strain.
41
42. Advantages
Compatible with the wood structure, i.e. can
be nailed
Lighter weight than a steel section
Less deep than wood alone
Stronger than wood alone
Allow longer spans
The section can vary over the length of the
span to optimize the member
The wood stabilizes the thin steel plate
42
43. Flexure Stress using Transformed Sections
basic flexural stress equation, derived based on a
homogeneous section.
Therefore, to use the stress equation one needs to
“transform” the composite section into a homogeneous
section
For the new “transformed section” to behave like the
actual section, the stiffness of both would need to be the
same.
Since Young’s Modulus, E, represents the material
stiffness, when transforming one material into another, the
area of the transformed material must be scaled by the
ratio of one E to the other.
In order to also get the correct stiffness for the moment of
Inertia, I, only the width of the geometry is scaled. Using I
from the transformed section (ITR) will then give the same
flexural stiffness as in the original section.
43
46. Calculate the Transformed Section, ITR
Use the ratio of the E modulus from each material
to calculate a modular ratio, n.
Usually the softer (lower E) material is used as a
base (denominator). Each material combination
has a different n.
Construct a transformed section by scaling the
width of each material by its modular, n.
Itr is calculated about the N.A. using the
transformation equation (parallel axis theorem)
with the transformed section.
Separate transformed sections must be created
for each axis (x-x and y-y)
46